| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Dalvik.h" |
| #include "libdex/OpCode.h" |
| #include "interp/Jit.h" |
| #include "CompilerInternals.h" |
| #include "Dataflow.h" |
| |
| /* |
| * Parse an instruction, return the length of the instruction |
| */ |
| static inline int parseInsn(const u2 *codePtr, DecodedInstruction *decInsn, |
| bool printMe) |
| { |
| u2 instr = *codePtr; |
| OpCode opcode = instr & 0xff; |
| int insnWidth; |
| |
| // Don't parse instruction data |
| if (opcode == OP_NOP && instr != 0) { |
| return 0; |
| } else { |
| insnWidth = gDvm.instrWidth[opcode]; |
| if (insnWidth < 0) { |
| insnWidth = -insnWidth; |
| } |
| } |
| |
| dexDecodeInstruction(gDvm.instrFormat, codePtr, decInsn); |
| if (printMe) { |
| char *decodedString = dvmCompilerGetDalvikDisassembly(decInsn, NULL); |
| LOGD("%p: %#06x %s\n", codePtr, opcode, decodedString); |
| } |
| return insnWidth; |
| } |
| |
| #define UNKNOWN_TARGET 0xffffffff |
| |
| /* |
| * Identify block-ending instructions and collect supplemental information |
| * regarding the following instructions. |
| */ |
| static inline bool findBlockBoundary(const Method *caller, MIR *insn, |
| unsigned int curOffset, |
| unsigned int *target, bool *isInvoke, |
| const Method **callee) |
| { |
| switch (insn->dalvikInsn.opCode) { |
| /* Target is not compile-time constant */ |
| case OP_RETURN_VOID: |
| case OP_RETURN: |
| case OP_RETURN_WIDE: |
| case OP_RETURN_OBJECT: |
| case OP_THROW: |
| *target = UNKNOWN_TARGET; |
| break; |
| case OP_INVOKE_VIRTUAL: |
| case OP_INVOKE_VIRTUAL_RANGE: |
| case OP_INVOKE_INTERFACE: |
| case OP_INVOKE_INTERFACE_RANGE: |
| case OP_INVOKE_VIRTUAL_QUICK: |
| case OP_INVOKE_VIRTUAL_QUICK_RANGE: |
| *isInvoke = true; |
| break; |
| case OP_INVOKE_SUPER: |
| case OP_INVOKE_SUPER_RANGE: { |
| int mIndex = caller->clazz->pDvmDex-> |
| pResMethods[insn->dalvikInsn.vB]->methodIndex; |
| const Method *calleeMethod = |
| caller->clazz->super->vtable[mIndex]; |
| |
| if (calleeMethod && !dvmIsNativeMethod(calleeMethod)) { |
| *target = (unsigned int) calleeMethod->insns; |
| } |
| *isInvoke = true; |
| *callee = calleeMethod; |
| break; |
| } |
| case OP_INVOKE_STATIC: |
| case OP_INVOKE_STATIC_RANGE: { |
| const Method *calleeMethod = |
| caller->clazz->pDvmDex->pResMethods[insn->dalvikInsn.vB]; |
| |
| if (calleeMethod && !dvmIsNativeMethod(calleeMethod)) { |
| *target = (unsigned int) calleeMethod->insns; |
| } |
| *isInvoke = true; |
| *callee = calleeMethod; |
| break; |
| } |
| case OP_INVOKE_SUPER_QUICK: |
| case OP_INVOKE_SUPER_QUICK_RANGE: { |
| const Method *calleeMethod = |
| caller->clazz->super->vtable[insn->dalvikInsn.vB]; |
| |
| if (calleeMethod && !dvmIsNativeMethod(calleeMethod)) { |
| *target = (unsigned int) calleeMethod->insns; |
| } |
| *isInvoke = true; |
| *callee = calleeMethod; |
| break; |
| } |
| case OP_INVOKE_DIRECT: |
| case OP_INVOKE_DIRECT_RANGE: { |
| const Method *calleeMethod = |
| caller->clazz->pDvmDex->pResMethods[insn->dalvikInsn.vB]; |
| if (calleeMethod && !dvmIsNativeMethod(calleeMethod)) { |
| *target = (unsigned int) calleeMethod->insns; |
| } |
| *isInvoke = true; |
| *callee = calleeMethod; |
| break; |
| } |
| case OP_GOTO: |
| case OP_GOTO_16: |
| case OP_GOTO_32: |
| *target = curOffset + (int) insn->dalvikInsn.vA; |
| break; |
| |
| case OP_IF_EQ: |
| case OP_IF_NE: |
| case OP_IF_LT: |
| case OP_IF_GE: |
| case OP_IF_GT: |
| case OP_IF_LE: |
| *target = curOffset + (int) insn->dalvikInsn.vC; |
| break; |
| |
| case OP_IF_EQZ: |
| case OP_IF_NEZ: |
| case OP_IF_LTZ: |
| case OP_IF_GEZ: |
| case OP_IF_GTZ: |
| case OP_IF_LEZ: |
| *target = curOffset + (int) insn->dalvikInsn.vB; |
| break; |
| |
| default: |
| return false; |
| } |
| return true; |
| } |
| |
| static inline bool isGoto(MIR *insn) |
| { |
| switch (insn->dalvikInsn.opCode) { |
| case OP_GOTO: |
| case OP_GOTO_16: |
| case OP_GOTO_32: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| /* |
| * Identify unconditional branch instructions |
| */ |
| static inline bool isUnconditionalBranch(MIR *insn) |
| { |
| switch (insn->dalvikInsn.opCode) { |
| case OP_RETURN_VOID: |
| case OP_RETURN: |
| case OP_RETURN_WIDE: |
| case OP_RETURN_OBJECT: |
| return true; |
| default: |
| return isGoto(insn); |
| } |
| } |
| |
| /* |
| * dvmHashTableLookup() callback |
| */ |
| static int compareMethod(const CompilerMethodStats *m1, |
| const CompilerMethodStats *m2) |
| { |
| return (int) m1->method - (int) m2->method; |
| } |
| |
| /* |
| * Analyze the body of the method to collect high-level information regarding |
| * inlining: |
| * - is empty method? |
| * - is getter/setter? |
| * - can throw exception? |
| * |
| * Currently the inliner only handles getters and setters. When its capability |
| * becomes more sophisticated more information will be retrieved here. |
| */ |
| static int analyzeInlineTarget(DecodedInstruction *dalvikInsn, int attributes, |
| int offset) |
| { |
| int flags = dexGetInstrFlags(gDvm.instrFlags, dalvikInsn->opCode); |
| int dalvikOpCode = dalvikInsn->opCode; |
| |
| if ((flags & kInstrInvoke) && |
| (dalvikOpCode != OP_INVOKE_DIRECT_EMPTY)) { |
| attributes &= ~METHOD_IS_LEAF; |
| } |
| |
| if (!(flags & kInstrCanReturn)) { |
| if (!(dvmCompilerDataFlowAttributes[dalvikOpCode] & |
| DF_IS_GETTER)) { |
| attributes &= ~METHOD_IS_GETTER; |
| } |
| if (!(dvmCompilerDataFlowAttributes[dalvikOpCode] & |
| DF_IS_SETTER)) { |
| attributes &= ~METHOD_IS_SETTER; |
| } |
| } |
| |
| /* |
| * The expected instruction sequence is setter will never return value and |
| * getter will also do. Clear the bits if the behavior is discovered |
| * otherwise. |
| */ |
| if (flags & kInstrCanReturn) { |
| if (dalvikOpCode == OP_RETURN_VOID) { |
| attributes &= ~METHOD_IS_GETTER; |
| } |
| else { |
| attributes &= ~METHOD_IS_SETTER; |
| } |
| } |
| |
| if (flags & kInstrCanThrow) { |
| attributes &= ~METHOD_IS_THROW_FREE; |
| } |
| |
| if (offset == 0 && dalvikOpCode == OP_RETURN_VOID) { |
| attributes |= METHOD_IS_EMPTY; |
| } |
| |
| /* |
| * Check if this opcode is selected for single stepping. |
| * If so, don't inline the callee as there is no stack frame for the |
| * interpreter to single-step through the instruction. |
| */ |
| if (SINGLE_STEP_OP(dalvikOpCode)) { |
| attributes &= ~(METHOD_IS_GETTER | METHOD_IS_SETTER); |
| } |
| |
| return attributes; |
| } |
| |
| /* |
| * Analyze each method whose traces are ever compiled. Collect a variety of |
| * statistics like the ratio of exercised vs overall code and code bloat |
| * ratios. If isCallee is true, also analyze each instruction in more details |
| * to see if it is suitable for inlining. |
| */ |
| CompilerMethodStats *dvmCompilerAnalyzeMethodBody(const Method *method, |
| bool isCallee) |
| { |
| const DexCode *dexCode = dvmGetMethodCode(method); |
| const u2 *codePtr = dexCode->insns; |
| const u2 *codeEnd = dexCode->insns + dexCode->insnsSize; |
| int insnSize = 0; |
| int hashValue = dvmComputeUtf8Hash(method->name); |
| |
| CompilerMethodStats dummyMethodEntry; // For hash table lookup |
| CompilerMethodStats *realMethodEntry; // For hash table storage |
| |
| /* For lookup only */ |
| dummyMethodEntry.method = method; |
| realMethodEntry = dvmHashTableLookup(gDvmJit.methodStatsTable, hashValue, |
| &dummyMethodEntry, |
| (HashCompareFunc) compareMethod, |
| false); |
| |
| /* This method has never been analyzed before - create an entry */ |
| if (realMethodEntry == NULL) { |
| realMethodEntry = |
| (CompilerMethodStats *) calloc(1, sizeof(CompilerMethodStats)); |
| realMethodEntry->method = method; |
| |
| dvmHashTableLookup(gDvmJit.methodStatsTable, hashValue, |
| realMethodEntry, |
| (HashCompareFunc) compareMethod, |
| true); |
| } |
| |
| /* This method is invoked as a callee and has been analyzed - just return */ |
| if ((isCallee == true) && (realMethodEntry->attributes & METHOD_IS_CALLEE)) |
| return realMethodEntry; |
| |
| /* |
| * Similarly, return if this method has been compiled before as a hot |
| * method already. |
| */ |
| if ((isCallee == false) && |
| (realMethodEntry->attributes & METHOD_IS_HOT)) |
| return realMethodEntry; |
| |
| int attributes; |
| |
| /* Method hasn't been analyzed for the desired purpose yet */ |
| if (isCallee) { |
| /* Aggressively set the attributes until proven otherwise */ |
| attributes = METHOD_IS_LEAF | METHOD_IS_THROW_FREE | METHOD_IS_CALLEE | |
| METHOD_IS_GETTER | METHOD_IS_SETTER; |
| } else { |
| attributes = METHOD_IS_HOT; |
| } |
| |
| /* Count the number of instructions */ |
| while (codePtr < codeEnd) { |
| DecodedInstruction dalvikInsn; |
| int width = parseInsn(codePtr, &dalvikInsn, false); |
| |
| /* Terminate when the data section is seen */ |
| if (width == 0) |
| break; |
| |
| if (isCallee) { |
| attributes = analyzeInlineTarget(&dalvikInsn, attributes, insnSize); |
| } |
| |
| insnSize += width; |
| codePtr += width; |
| } |
| |
| /* |
| * Only handle simple getters/setters with one instruction followed by |
| * return |
| */ |
| if ((attributes & (METHOD_IS_GETTER | METHOD_IS_SETTER)) && |
| (insnSize != 3)) { |
| attributes &= ~(METHOD_IS_GETTER | METHOD_IS_SETTER); |
| } |
| |
| realMethodEntry->dalvikSize = insnSize * 2; |
| realMethodEntry->attributes |= attributes; |
| |
| #if 0 |
| /* Uncomment the following to explore various callee patterns */ |
| if (attributes & METHOD_IS_THROW_FREE) { |
| LOGE("%s%s is inlinable%s", method->clazz->descriptor, method->name, |
| (attributes & METHOD_IS_EMPTY) ? " empty" : ""); |
| } |
| |
| if (attributes & METHOD_IS_LEAF) { |
| LOGE("%s%s is leaf %d%s", method->clazz->descriptor, method->name, |
| insnSize, insnSize < 5 ? " (small)" : ""); |
| } |
| |
| if (attributes & (METHOD_IS_GETTER | METHOD_IS_SETTER)) { |
| LOGE("%s%s is %s", method->clazz->descriptor, method->name, |
| attributes & METHOD_IS_GETTER ? "getter": "setter"); |
| } |
| if (attributes == |
| (METHOD_IS_LEAF | METHOD_IS_THROW_FREE | METHOD_IS_CALLEE)) { |
| LOGE("%s%s is inlinable non setter/getter", method->clazz->descriptor, |
| method->name); |
| } |
| #endif |
| |
| return realMethodEntry; |
| } |
| |
| /* |
| * Crawl the stack of the thread that requesed compilation to see if any of the |
| * ancestors are on the blacklist. |
| */ |
| bool filterMethodByCallGraph(Thread *thread, const char *curMethodName) |
| { |
| /* Crawl the Dalvik stack frames and compare the method name*/ |
| StackSaveArea *ssaPtr = ((StackSaveArea *) thread->curFrame) - 1; |
| while (ssaPtr != ((StackSaveArea *) NULL) - 1) { |
| const Method *method = ssaPtr->method; |
| if (method) { |
| int hashValue = dvmComputeUtf8Hash(method->name); |
| bool found = |
| dvmHashTableLookup(gDvmJit.methodTable, hashValue, |
| (char *) method->name, |
| (HashCompareFunc) strcmp, false) != |
| NULL; |
| if (found) { |
| LOGD("Method %s (--> %s) found on the JIT %s list", |
| method->name, curMethodName, |
| gDvmJit.includeSelectedMethod ? "white" : "black"); |
| return true; |
| } |
| |
| } |
| ssaPtr = ((StackSaveArea *) ssaPtr->prevFrame) - 1; |
| }; |
| return false; |
| } |
| |
| /* |
| * Main entry point to start trace compilation. Basic blocks are constructed |
| * first and they will be passed to the codegen routines to convert Dalvik |
| * bytecode into machine code. |
| */ |
| bool dvmCompileTrace(JitTraceDescription *desc, int numMaxInsts, |
| JitTranslationInfo *info, jmp_buf *bailPtr, |
| int optHints) |
| { |
| const DexCode *dexCode = dvmGetMethodCode(desc->method); |
| const JitTraceRun* currRun = &desc->trace[0]; |
| unsigned int curOffset = currRun->frag.startOffset; |
| unsigned int numInsts = currRun->frag.numInsts; |
| const u2 *codePtr = dexCode->insns + curOffset; |
| int traceSize = 0; // # of half-words |
| const u2 *startCodePtr = codePtr; |
| BasicBlock *startBB, *curBB, *lastBB; |
| int numBlocks = 0; |
| static int compilationId; |
| CompilationUnit cUnit; |
| #if defined(WITH_JIT_TUNING) |
| CompilerMethodStats *methodStats; |
| #endif |
| |
| /* If we've already compiled this trace, just return success */ |
| if (dvmJitGetCodeAddr(startCodePtr) && !info->discardResult) { |
| /* |
| * Make sure the codeAddress is NULL so that it won't clobber the |
| * existing entry. |
| */ |
| info->codeAddress = NULL; |
| return true; |
| } |
| |
| compilationId++; |
| memset(&cUnit, 0, sizeof(CompilationUnit)); |
| |
| #if defined(WITH_JIT_TUNING) |
| /* Locate the entry to store compilation statistics for this method */ |
| methodStats = dvmCompilerAnalyzeMethodBody(desc->method, false); |
| #endif |
| |
| /* Set the recover buffer pointer */ |
| cUnit.bailPtr = bailPtr; |
| |
| /* Initialize the printMe flag */ |
| cUnit.printMe = gDvmJit.printMe; |
| |
| /* Initialize the profile flag */ |
| cUnit.executionCount = gDvmJit.profile; |
| |
| /* Setup the method */ |
| cUnit.method = desc->method; |
| |
| /* Initialize the PC reconstruction list */ |
| dvmInitGrowableList(&cUnit.pcReconstructionList, 8); |
| |
| /* Identify traces that we don't want to compile */ |
| if (gDvmJit.methodTable) { |
| int len = strlen(desc->method->clazz->descriptor) + |
| strlen(desc->method->name) + 1; |
| char *fullSignature = dvmCompilerNew(len, true); |
| strcpy(fullSignature, desc->method->clazz->descriptor); |
| strcat(fullSignature, desc->method->name); |
| |
| int hashValue = dvmComputeUtf8Hash(fullSignature); |
| |
| /* |
| * Doing three levels of screening to see whether we want to skip |
| * compiling this method |
| */ |
| |
| /* First, check the full "class;method" signature */ |
| bool methodFound = |
| dvmHashTableLookup(gDvmJit.methodTable, hashValue, |
| fullSignature, (HashCompareFunc) strcmp, |
| false) != |
| NULL; |
| |
| /* Full signature not found - check the enclosing class */ |
| if (methodFound == false) { |
| int hashValue = dvmComputeUtf8Hash(desc->method->clazz->descriptor); |
| methodFound = |
| dvmHashTableLookup(gDvmJit.methodTable, hashValue, |
| (char *) desc->method->clazz->descriptor, |
| (HashCompareFunc) strcmp, false) != |
| NULL; |
| /* Enclosing class not found - check the method name */ |
| if (methodFound == false) { |
| int hashValue = dvmComputeUtf8Hash(desc->method->name); |
| methodFound = |
| dvmHashTableLookup(gDvmJit.methodTable, hashValue, |
| (char *) desc->method->name, |
| (HashCompareFunc) strcmp, false) != |
| NULL; |
| |
| /* |
| * Debug by call-graph is enabled. Check if the debug list |
| * covers any methods on the VM stack. |
| */ |
| if (methodFound == false && gDvmJit.checkCallGraph == true) { |
| methodFound = |
| filterMethodByCallGraph(info->requestingThread, |
| desc->method->name); |
| } |
| } |
| } |
| |
| /* |
| * Under the following conditions, the trace will be *conservatively* |
| * compiled by only containing single-step instructions to and from the |
| * interpreter. |
| * 1) If includeSelectedMethod == false, the method matches the full or |
| * partial signature stored in the hash table. |
| * |
| * 2) If includeSelectedMethod == true, the method does not match the |
| * full and partial signature stored in the hash table. |
| */ |
| if (gDvmJit.includeSelectedMethod != methodFound) { |
| cUnit.allSingleStep = true; |
| } else { |
| /* Compile the trace as normal */ |
| |
| /* Print the method we cherry picked */ |
| if (gDvmJit.includeSelectedMethod == true) { |
| cUnit.printMe = true; |
| } |
| } |
| } |
| |
| /* Allocate the entry block */ |
| lastBB = startBB = curBB = dvmCompilerNewBB(kTraceEntryBlock); |
| curBB->startOffset = curOffset; |
| curBB->id = numBlocks++; |
| |
| curBB = dvmCompilerNewBB(kDalvikByteCode); |
| curBB->startOffset = curOffset; |
| curBB->id = numBlocks++; |
| |
| /* Make the first real dalvik block the fallthrough of the entry block */ |
| startBB->fallThrough = curBB; |
| lastBB->next = curBB; |
| lastBB = curBB; |
| |
| if (cUnit.printMe) { |
| LOGD("--------\nCompiler: Building trace for %s, offset 0x%x\n", |
| desc->method->name, curOffset); |
| } |
| |
| /* |
| * Analyze the trace descriptor and include up to the maximal number |
| * of Dalvik instructions into the IR. |
| */ |
| while (1) { |
| MIR *insn; |
| int width; |
| insn = dvmCompilerNew(sizeof(MIR), true); |
| insn->offset = curOffset; |
| width = parseInsn(codePtr, &insn->dalvikInsn, cUnit.printMe); |
| |
| /* The trace should never incude instruction data */ |
| assert(width); |
| insn->width = width; |
| traceSize += width; |
| dvmCompilerAppendMIR(curBB, insn); |
| cUnit.numInsts++; |
| |
| int flags = dexGetInstrFlags(gDvm.instrFlags, insn->dalvikInsn.opCode); |
| |
| if ((flags & kInstrInvoke) && |
| (insn->dalvikInsn.opCode != OP_INVOKE_DIRECT_EMPTY)) { |
| assert(numInsts == 1); |
| CallsiteInfo *callsiteInfo = |
| dvmCompilerNew(sizeof(CallsiteInfo), true); |
| callsiteInfo->clazz = currRun[1].meta; |
| callsiteInfo->method = currRun[2].meta; |
| insn->meta.callsiteInfo = callsiteInfo; |
| } |
| |
| /* Instruction limit reached - terminate the trace here */ |
| if (cUnit.numInsts >= numMaxInsts) { |
| break; |
| } |
| if (--numInsts == 0) { |
| if (currRun->frag.runEnd) { |
| break; |
| } else { |
| /* Advance to the next trace description (ie non-meta info) */ |
| do { |
| currRun++; |
| } while (!currRun->frag.isCode); |
| |
| /* Dummy end-of-run marker seen */ |
| if (currRun->frag.numInsts == 0) { |
| break; |
| } |
| |
| curBB = dvmCompilerNewBB(kDalvikByteCode); |
| lastBB->next = curBB; |
| lastBB = curBB; |
| curBB->id = numBlocks++; |
| curOffset = currRun->frag.startOffset; |
| numInsts = currRun->frag.numInsts; |
| curBB->startOffset = curOffset; |
| codePtr = dexCode->insns + curOffset; |
| } |
| } else { |
| curOffset += width; |
| codePtr += width; |
| } |
| } |
| |
| #if defined(WITH_JIT_TUNING) |
| /* Convert # of half-word to bytes */ |
| methodStats->compiledDalvikSize += traceSize * 2; |
| #endif |
| |
| /* |
| * Now scan basic blocks containing real code to connect the |
| * taken/fallthrough links. Also create chaining cells for code not included |
| * in the trace. |
| */ |
| for (curBB = startBB; curBB; curBB = curBB->next) { |
| MIR *lastInsn = curBB->lastMIRInsn; |
| /* Skip empty blocks */ |
| if (lastInsn == NULL) { |
| continue; |
| } |
| curOffset = lastInsn->offset; |
| unsigned int targetOffset = curOffset; |
| unsigned int fallThroughOffset = curOffset + lastInsn->width; |
| bool isInvoke = false; |
| const Method *callee = NULL; |
| |
| findBlockBoundary(desc->method, curBB->lastMIRInsn, curOffset, |
| &targetOffset, &isInvoke, &callee); |
| |
| /* Link the taken and fallthrough blocks */ |
| BasicBlock *searchBB; |
| |
| int flags = dexGetInstrFlags(gDvm.instrFlags, |
| lastInsn->dalvikInsn.opCode); |
| |
| if (flags & kInstrInvoke) { |
| cUnit.hasInvoke = true; |
| } |
| |
| /* No backward branch in the trace - start searching the next BB */ |
| for (searchBB = curBB->next; searchBB; searchBB = searchBB->next) { |
| if (targetOffset == searchBB->startOffset) { |
| curBB->taken = searchBB; |
| } |
| if (fallThroughOffset == searchBB->startOffset) { |
| curBB->fallThrough = searchBB; |
| |
| /* |
| * Fallthrough block of an invoke instruction needs to be |
| * aligned to 4-byte boundary (alignment instruction to be |
| * inserted later. |
| */ |
| if (flags & kInstrInvoke) { |
| searchBB->isFallThroughFromInvoke = true; |
| } |
| } |
| } |
| |
| /* |
| * Some blocks are ended by non-control-flow-change instructions, |
| * currently only due to trace length constraint. In this case we need |
| * to generate an explicit branch at the end of the block to jump to |
| * the chaining cell. |
| * |
| * NOTE: INVOKE_DIRECT_EMPTY is actually not an invoke but a nop |
| */ |
| curBB->needFallThroughBranch = |
| ((flags & (kInstrCanBranch | kInstrCanSwitch | kInstrCanReturn | |
| kInstrInvoke)) == 0) || |
| (lastInsn->dalvikInsn.opCode == OP_INVOKE_DIRECT_EMPTY); |
| |
| /* Only form a loop if JIT_OPT_NO_LOOP is not set */ |
| if (curBB->taken == NULL && |
| curBB->fallThrough == NULL && |
| flags == (kInstrCanBranch | kInstrCanContinue) && |
| fallThroughOffset == startBB->startOffset && |
| JIT_OPT_NO_LOOP != (optHints & JIT_OPT_NO_LOOP)) { |
| BasicBlock *loopBranch = curBB; |
| BasicBlock *exitBB; |
| BasicBlock *exitChainingCell; |
| |
| if (cUnit.printMe) { |
| LOGD("Natural loop detected!"); |
| } |
| exitBB = dvmCompilerNewBB(kTraceExitBlock); |
| lastBB->next = exitBB; |
| lastBB = exitBB; |
| |
| exitBB->startOffset = targetOffset; |
| exitBB->id = numBlocks++; |
| exitBB->needFallThroughBranch = true; |
| |
| loopBranch->taken = exitBB; |
| #if defined(WITH_SELF_VERIFICATION) |
| BasicBlock *backwardCell = |
| dvmCompilerNewBB(kChainingCellBackwardBranch); |
| lastBB->next = backwardCell; |
| lastBB = backwardCell; |
| |
| backwardCell->startOffset = startBB->startOffset; |
| backwardCell->id = numBlocks++; |
| loopBranch->fallThrough = backwardCell; |
| #elif defined(WITH_JIT_TUNING) |
| if (gDvmJit.profile) { |
| BasicBlock *backwardCell = |
| dvmCompilerNewBB(kChainingCellBackwardBranch); |
| lastBB->next = backwardCell; |
| lastBB = backwardCell; |
| |
| backwardCell->startOffset = startBB->startOffset; |
| backwardCell->id = numBlocks++; |
| loopBranch->fallThrough = backwardCell; |
| } else { |
| loopBranch->fallThrough = startBB->next; |
| } |
| #else |
| loopBranch->fallThrough = startBB->next; |
| #endif |
| |
| /* Create the chaining cell as the fallthrough of the exit block */ |
| exitChainingCell = dvmCompilerNewBB(kChainingCellNormal); |
| lastBB->next = exitChainingCell; |
| lastBB = exitChainingCell; |
| |
| exitChainingCell->startOffset = targetOffset; |
| exitChainingCell->id = numBlocks++; |
| |
| exitBB->fallThrough = exitChainingCell; |
| |
| cUnit.hasLoop = true; |
| } |
| |
| if (lastInsn->dalvikInsn.opCode == OP_PACKED_SWITCH || |
| lastInsn->dalvikInsn.opCode == OP_SPARSE_SWITCH) { |
| int i; |
| const u2 *switchData = desc->method->insns + lastInsn->offset + |
| lastInsn->dalvikInsn.vB; |
| int size = switchData[1]; |
| int maxChains = MIN(size, MAX_CHAINED_SWITCH_CASES); |
| |
| /* |
| * Generate the landing pad for cases whose ranks are higher than |
| * MAX_CHAINED_SWITCH_CASES. The code will re-enter the interpreter |
| * through the NoChain point. |
| */ |
| if (maxChains != size) { |
| cUnit.switchOverflowPad = |
| desc->method->insns + lastInsn->offset; |
| } |
| |
| s4 *targets = (s4 *) (switchData + 2 + |
| (lastInsn->dalvikInsn.opCode == OP_PACKED_SWITCH ? |
| 2 : size * 2)); |
| |
| /* One chaining cell for the first MAX_CHAINED_SWITCH_CASES cases */ |
| for (i = 0; i < maxChains; i++) { |
| BasicBlock *caseChain = dvmCompilerNewBB(kChainingCellNormal); |
| lastBB->next = caseChain; |
| lastBB = caseChain; |
| |
| caseChain->startOffset = lastInsn->offset + targets[i]; |
| caseChain->id = numBlocks++; |
| } |
| |
| /* One more chaining cell for the default case */ |
| BasicBlock *caseChain = dvmCompilerNewBB(kChainingCellNormal); |
| lastBB->next = caseChain; |
| lastBB = caseChain; |
| |
| caseChain->startOffset = lastInsn->offset + lastInsn->width; |
| caseChain->id = numBlocks++; |
| /* Fallthrough block not included in the trace */ |
| } else if (!isUnconditionalBranch(lastInsn) && |
| curBB->fallThrough == NULL) { |
| /* |
| * If the chaining cell is after an invoke or |
| * instruction that cannot change the control flow, request a hot |
| * chaining cell. |
| */ |
| if (isInvoke || curBB->needFallThroughBranch) { |
| lastBB->next = dvmCompilerNewBB(kChainingCellHot); |
| } else { |
| lastBB->next = dvmCompilerNewBB(kChainingCellNormal); |
| } |
| lastBB = lastBB->next; |
| lastBB->id = numBlocks++; |
| lastBB->startOffset = fallThroughOffset; |
| curBB->fallThrough = lastBB; |
| } |
| /* Target block not included in the trace */ |
| if (curBB->taken == NULL && |
| (isGoto(lastInsn) || isInvoke || |
| (targetOffset != UNKNOWN_TARGET && targetOffset != curOffset))) { |
| BasicBlock *newBB; |
| if (isInvoke) { |
| /* Monomorphic callee */ |
| if (callee) { |
| newBB = dvmCompilerNewBB(kChainingCellInvokeSingleton); |
| newBB->startOffset = 0; |
| newBB->containingMethod = callee; |
| /* Will resolve at runtime */ |
| } else { |
| newBB = dvmCompilerNewBB(kChainingCellInvokePredicted); |
| newBB->startOffset = 0; |
| } |
| /* For unconditional branches, request a hot chaining cell */ |
| } else { |
| #if !defined(WITH_SELF_VERIFICATION) |
| newBB = dvmCompilerNewBB(flags & kInstrUnconditional ? |
| kChainingCellHot : |
| kChainingCellNormal); |
| newBB->startOffset = targetOffset; |
| #else |
| /* Handle branches that branch back into the block */ |
| if (targetOffset >= curBB->firstMIRInsn->offset && |
| targetOffset <= curBB->lastMIRInsn->offset) { |
| newBB = dvmCompilerNewBB(kChainingCellBackwardBranch); |
| } else { |
| newBB = dvmCompilerNewBB(flags & kInstrUnconditional ? |
| kChainingCellHot : |
| kChainingCellNormal); |
| } |
| newBB->startOffset = targetOffset; |
| #endif |
| } |
| newBB->id = numBlocks++; |
| curBB->taken = newBB; |
| lastBB->next = newBB; |
| lastBB = newBB; |
| } |
| } |
| |
| /* Now create a special block to host PC reconstruction code */ |
| lastBB->next = dvmCompilerNewBB(kPCReconstruction); |
| lastBB = lastBB->next; |
| lastBB->id = numBlocks++; |
| |
| /* And one final block that publishes the PC and raise the exception */ |
| lastBB->next = dvmCompilerNewBB(kExceptionHandling); |
| lastBB = lastBB->next; |
| lastBB->id = numBlocks++; |
| |
| if (cUnit.printMe) { |
| char* signature = dexProtoCopyMethodDescriptor(&desc->method->prototype); |
| LOGD("TRACEINFO (%d): 0x%08x %s%s.%s 0x%x %d of %d, %d blocks", |
| compilationId, |
| (intptr_t) desc->method->insns, |
| desc->method->clazz->descriptor, |
| desc->method->name, |
| signature, |
| desc->trace[0].frag.startOffset, |
| traceSize, |
| dexCode->insnsSize, |
| numBlocks); |
| free(signature); |
| } |
| |
| BasicBlock **blockList; |
| |
| cUnit.traceDesc = desc; |
| cUnit.numBlocks = numBlocks; |
| blockList = cUnit.blockList = |
| dvmCompilerNew(sizeof(BasicBlock *) * numBlocks, true); |
| |
| int i; |
| |
| for (i = 0, curBB = startBB; i < numBlocks; i++) { |
| blockList[i] = curBB; |
| curBB = curBB->next; |
| } |
| /* Make sure all blocks are added to the cUnit */ |
| assert(curBB == NULL); |
| |
| /* Set the instruction set to use (NOTE: later components may change it) */ |
| cUnit.instructionSet = dvmCompilerInstructionSet(); |
| |
| /* Inline transformation @ the MIR level */ |
| if (cUnit.hasInvoke && !(gDvmJit.disableOpt & (1 << kMethodInlining))) { |
| dvmCompilerInlineMIR(&cUnit); |
| } |
| |
| /* Preparation for SSA conversion */ |
| dvmInitializeSSAConversion(&cUnit); |
| |
| if (cUnit.hasLoop) { |
| /* |
| * Loop is not optimizable (for example lack of a single induction |
| * variable), punt and recompile the trace with loop optimization |
| * disabled. |
| */ |
| bool loopOpt = dvmCompilerLoopOpt(&cUnit); |
| if (loopOpt == false) { |
| if (cUnit.printMe) { |
| LOGD("Loop is not optimizable - retry codegen"); |
| } |
| /* Reset the compiler resource pool */ |
| dvmCompilerArenaReset(); |
| return dvmCompileTrace(desc, cUnit.numInsts, info, bailPtr, |
| optHints | JIT_OPT_NO_LOOP); |
| } |
| } |
| else { |
| dvmCompilerNonLoopAnalysis(&cUnit); |
| } |
| |
| dvmCompilerInitializeRegAlloc(&cUnit); // Needs to happen after SSA naming |
| |
| if (cUnit.printMe) { |
| dvmCompilerDumpCompilationUnit(&cUnit); |
| } |
| |
| /* Allocate Registers */ |
| dvmCompilerRegAlloc(&cUnit); |
| |
| /* Convert MIR to LIR, etc. */ |
| dvmCompilerMIR2LIR(&cUnit); |
| |
| /* Convert LIR into machine code. Loop for recoverable retries */ |
| do { |
| dvmCompilerAssembleLIR(&cUnit, info); |
| cUnit.assemblerRetries++; |
| if (cUnit.printMe && cUnit.assemblerStatus != kSuccess) |
| LOGD("Assembler abort #%d on %d",cUnit.assemblerRetries, |
| cUnit.assemblerStatus); |
| } while (cUnit.assemblerStatus == kRetryAll); |
| |
| if (cUnit.printMe) { |
| dvmCompilerCodegenDump(&cUnit); |
| LOGD("End %s%s, %d Dalvik instructions", |
| desc->method->clazz->descriptor, desc->method->name, |
| cUnit.numInsts); |
| } |
| |
| /* Reset the compiler resource pool */ |
| dvmCompilerArenaReset(); |
| |
| if (cUnit.assemblerStatus == kRetryHalve) { |
| /* Halve the instruction count and start from the top */ |
| return dvmCompileTrace(desc, cUnit.numInsts / 2, info, bailPtr, |
| optHints); |
| } |
| |
| assert(cUnit.assemblerStatus == kSuccess); |
| #if defined(WITH_JIT_TUNING) |
| methodStats->nativeSize += cUnit.totalSize; |
| #endif |
| return info->codeAddress != NULL; |
| } |
| |
| /* |
| * Since we are including instructions from possibly a cold method into the |
| * current trace, we need to make sure that all the associated information |
| * with the callee is properly initialized. If not, we punt on this inline |
| * target. |
| * |
| * TODO: volatile instructions will be handled later. |
| */ |
| bool dvmCompilerCanIncludeThisInstruction(const Method *method, |
| const DecodedInstruction *insn) |
| { |
| switch (insn->opCode) { |
| case OP_NEW_INSTANCE: |
| case OP_CHECK_CAST: { |
| ClassObject *classPtr = (void*) |
| (method->clazz->pDvmDex->pResClasses[insn->vB]); |
| |
| /* Class hasn't been initialized yet */ |
| if (classPtr == NULL) { |
| return false; |
| } |
| return true; |
| } |
| case OP_SGET_OBJECT: |
| case OP_SGET_BOOLEAN: |
| case OP_SGET_CHAR: |
| case OP_SGET_BYTE: |
| case OP_SGET_SHORT: |
| case OP_SGET: |
| case OP_SGET_WIDE: |
| case OP_SPUT_OBJECT: |
| case OP_SPUT_BOOLEAN: |
| case OP_SPUT_CHAR: |
| case OP_SPUT_BYTE: |
| case OP_SPUT_SHORT: |
| case OP_SPUT: |
| case OP_SPUT_WIDE: { |
| void *fieldPtr = (void*) |
| (method->clazz->pDvmDex->pResFields[insn->vB]); |
| |
| if (fieldPtr == NULL) { |
| return false; |
| } |
| return true; |
| } |
| case OP_INVOKE_SUPER: |
| case OP_INVOKE_SUPER_RANGE: { |
| int mIndex = method->clazz->pDvmDex-> |
| pResMethods[insn->vB]->methodIndex; |
| const Method *calleeMethod = method->clazz->super->vtable[mIndex]; |
| if (calleeMethod == NULL) { |
| return false; |
| } |
| return true; |
| } |
| case OP_INVOKE_SUPER_QUICK: |
| case OP_INVOKE_SUPER_QUICK_RANGE: { |
| const Method *calleeMethod = method->clazz->super->vtable[insn->vB]; |
| if (calleeMethod == NULL) { |
| return false; |
| } |
| return true; |
| } |
| case OP_INVOKE_STATIC: |
| case OP_INVOKE_STATIC_RANGE: |
| case OP_INVOKE_DIRECT: |
| case OP_INVOKE_DIRECT_RANGE: { |
| const Method *calleeMethod = |
| method->clazz->pDvmDex->pResMethods[insn->vB]; |
| if (calleeMethod == NULL) { |
| return false; |
| } |
| return true; |
| } |
| case OP_CONST_CLASS: { |
| void *classPtr = (void*) |
| (method->clazz->pDvmDex->pResClasses[insn->vB]); |
| |
| if (classPtr == NULL) { |
| return false; |
| } |
| return true; |
| } |
| case OP_CONST_STRING_JUMBO: |
| case OP_CONST_STRING: { |
| void *strPtr = (void*) |
| (method->clazz->pDvmDex->pResStrings[insn->vB]); |
| |
| if (strPtr == NULL) { |
| return false; |
| } |
| return true; |
| } |
| default: |
| return true; |
| } |
| } |
| |
| /* |
| * Similar to dvmCompileTrace, but the entity processed here is the whole |
| * method. |
| * |
| * TODO: implementation will be revisited when the trace builder can provide |
| * whole-method traces. |
| */ |
| bool dvmCompileMethod(CompilationUnit *cUnit, const Method *method, |
| JitTranslationInfo *info) |
| { |
| const DexCode *dexCode = dvmGetMethodCode(method); |
| const u2 *codePtr = dexCode->insns; |
| const u2 *codeEnd = dexCode->insns + dexCode->insnsSize; |
| int blockID = 0; |
| unsigned int curOffset = 0; |
| |
| /* If we've already compiled this trace, just return success */ |
| if (dvmJitGetCodeAddr(codePtr) && !info->discardResult) { |
| return true; |
| } |
| |
| /* Doing method-based compilation */ |
| cUnit->wholeMethod = true; |
| |
| BasicBlock *firstBlock = dvmCompilerNewBB(kDalvikByteCode); |
| firstBlock->id = blockID++; |
| |
| /* Allocate the bit-vector to track the beginning of basic blocks */ |
| BitVector *bbStartAddr = dvmCompilerAllocBitVector(dexCode->insnsSize+1, |
| false); |
| dvmCompilerSetBit(bbStartAddr, 0); |
| |
| int numInvokeTargets = 0; |
| |
| /* |
| * Sequentially go through every instruction first and put them in a single |
| * basic block. Identify block boundaries at the mean time. |
| */ |
| while (codePtr < codeEnd) { |
| MIR *insn = dvmCompilerNew(sizeof(MIR), true); |
| insn->offset = curOffset; |
| int width = parseInsn(codePtr, &insn->dalvikInsn, false); |
| bool isInvoke = false; |
| const Method *callee; |
| insn->width = width; |
| |
| /* Terminate when the data section is seen */ |
| if (width == 0) |
| break; |
| |
| if (!dvmCompilerCanIncludeThisInstruction(cUnit->method, |
| &insn->dalvikInsn)) { |
| return false; |
| } |
| |
| dvmCompilerAppendMIR(firstBlock, insn); |
| /* |
| * Check whether this is a block ending instruction and whether it |
| * suggests the start of a new block |
| */ |
| unsigned int target = curOffset; |
| |
| /* |
| * If findBlockBoundary returns true, it means the current instruction |
| * is terminating the current block. If it is a branch, the target |
| * address will be recorded in target. |
| */ |
| if (findBlockBoundary(method, insn, curOffset, &target, &isInvoke, |
| &callee)) { |
| dvmCompilerSetBit(bbStartAddr, curOffset + width); |
| /* Each invoke needs a chaining cell block */ |
| if (isInvoke) { |
| numInvokeTargets++; |
| } |
| /* A branch will end the current block */ |
| else if (target != curOffset && target != UNKNOWN_TARGET) { |
| dvmCompilerSetBit(bbStartAddr, target); |
| } |
| } |
| |
| codePtr += width; |
| /* each bit represents 16-bit quantity */ |
| curOffset += width; |
| } |
| |
| /* |
| * The number of blocks will be equal to the number of bits set to 1 in the |
| * bit vector minus 1, because the bit representing the location after the |
| * last instruction is set to one. |
| * |
| * We also add additional blocks for invoke chaining and the number is |
| * denoted by numInvokeTargets. |
| */ |
| int numBlocks = dvmCountSetBits(bbStartAddr); |
| if (dvmIsBitSet(bbStartAddr, dexCode->insnsSize)) { |
| numBlocks--; |
| } |
| |
| BasicBlock **blockList; |
| blockList = cUnit->blockList = |
| dvmCompilerNew(sizeof(BasicBlock *) * (numBlocks + numInvokeTargets), |
| true); |
| |
| /* |
| * Register the first block onto the list and start splitting it into |
| * sub-blocks. |
| */ |
| blockList[0] = firstBlock; |
| cUnit->numBlocks = 1; |
| |
| int i; |
| for (i = 0; i < numBlocks; i++) { |
| MIR *insn; |
| BasicBlock *curBB = blockList[i]; |
| curOffset = curBB->lastMIRInsn->offset; |
| |
| for (insn = curBB->firstMIRInsn->next; insn; insn = insn->next) { |
| /* Found the beginning of a new block, see if it is created yet */ |
| if (dvmIsBitSet(bbStartAddr, insn->offset)) { |
| int j; |
| for (j = 0; j < cUnit->numBlocks; j++) { |
| if (blockList[j]->firstMIRInsn->offset == insn->offset) |
| break; |
| } |
| |
| /* Block not split yet - do it now */ |
| if (j == cUnit->numBlocks) { |
| BasicBlock *newBB = dvmCompilerNewBB(kDalvikByteCode); |
| newBB->id = blockID++; |
| newBB->firstMIRInsn = insn; |
| newBB->startOffset = insn->offset; |
| newBB->lastMIRInsn = curBB->lastMIRInsn; |
| curBB->lastMIRInsn = insn->prev; |
| insn->prev->next = NULL; |
| insn->prev = NULL; |
| |
| /* |
| * If the insn is not an unconditional branch, set up the |
| * fallthrough link. |
| */ |
| if (!isUnconditionalBranch(curBB->lastMIRInsn)) { |
| curBB->fallThrough = newBB; |
| } |
| |
| /* |
| * Fallthrough block of an invoke instruction needs to be |
| * aligned to 4-byte boundary (alignment instruction to be |
| * inserted later. |
| */ |
| if (dexGetInstrFlags(gDvm.instrFlags, |
| curBB->lastMIRInsn->dalvikInsn.opCode) & |
| kInstrInvoke) { |
| newBB->isFallThroughFromInvoke = true; |
| } |
| |
| /* enqueue the new block */ |
| blockList[cUnit->numBlocks++] = newBB; |
| break; |
| } |
| } |
| } |
| } |
| |
| if (numBlocks != cUnit->numBlocks) { |
| LOGE("Expect %d vs %d basic blocks\n", numBlocks, cUnit->numBlocks); |
| dvmCompilerAbort(cUnit); |
| } |
| |
| /* Connect the basic blocks through the taken links */ |
| for (i = 0; i < numBlocks; i++) { |
| BasicBlock *curBB = blockList[i]; |
| MIR *insn = curBB->lastMIRInsn; |
| unsigned int target = insn->offset; |
| bool isInvoke = false; |
| const Method *callee = NULL; |
| |
| findBlockBoundary(method, insn, target, &target, &isInvoke, &callee); |
| |
| /* Found a block ended on a branch (not invoke) */ |
| if (isInvoke == false && target != insn->offset) { |
| int j; |
| /* Forward branch */ |
| if (target > insn->offset) { |
| j = i + 1; |
| } else { |
| /* Backward branch */ |
| j = 0; |
| } |
| for (; j < numBlocks; j++) { |
| if (blockList[j]->firstMIRInsn->offset == target) { |
| curBB->taken = blockList[j]; |
| break; |
| } |
| } |
| } |
| |
| if (isInvoke) { |
| BasicBlock *newBB; |
| /* Monomorphic callee */ |
| if (callee) { |
| newBB = dvmCompilerNewBB(kChainingCellInvokeSingleton); |
| newBB->startOffset = 0; |
| newBB->containingMethod = callee; |
| /* Will resolve at runtime */ |
| } else { |
| newBB = dvmCompilerNewBB(kChainingCellInvokePredicted); |
| newBB->startOffset = 0; |
| } |
| newBB->id = blockID++; |
| curBB->taken = newBB; |
| /* enqueue the new block */ |
| blockList[cUnit->numBlocks++] = newBB; |
| } |
| } |
| |
| if (cUnit->numBlocks != numBlocks + numInvokeTargets) { |
| LOGE("Expect %d vs %d total blocks\n", numBlocks + numInvokeTargets, |
| cUnit->numBlocks); |
| dvmCompilerDumpCompilationUnit(cUnit); |
| dvmCompilerAbort(cUnit); |
| } |
| |
| /* Set the instruction set to use (NOTE: later components may change it) */ |
| cUnit->instructionSet = dvmCompilerInstructionSet(); |
| |
| /* Preparation for SSA conversion */ |
| dvmInitializeSSAConversion(cUnit); |
| |
| /* SSA analysis */ |
| dvmCompilerNonLoopAnalysis(cUnit); |
| |
| /* Needs to happen after SSA naming */ |
| dvmCompilerInitializeRegAlloc(cUnit); |
| |
| /* Allocate Registers */ |
| dvmCompilerRegAlloc(cUnit); |
| |
| /* Convert MIR to LIR, etc. */ |
| dvmCompilerMIR2LIR(cUnit); |
| |
| /* Convert LIR into machine code. */ |
| dvmCompilerAssembleLIR(cUnit, info); |
| |
| if (cUnit->assemblerStatus != kSuccess) { |
| return false; |
| } |
| |
| dvmCompilerDumpCompilationUnit(cUnit); |
| |
| dvmCompilerArenaReset(); |
| |
| return info->codeAddress != NULL; |
| } |
